Data/hora: 06/06/2024 05:45:35

Biblioteca(s): | Embrapa Meio Ambiente.
Data corrente: | 24/01/2018
Data da última atualização: | 30/10/2019
Autoria: | PITOMBO, L. M.; CANTARELLA, H.; PACKER, A. P.; RAMOS, N. P.; CARMO, J. B. do.
Afiliação: | LEONARDO MACHADO PITOMBO, IAC; HEITOR CANTARELLA, IAC; ANA PAULA CONTADOR PACKER, CNPMA; NILZA PATRICIA RAMOS, CNPMA; JANAINA BRAGA DO CARMO, UFSCar.
Título: | Straw preservation reduced total N2O emissions from a sugarcane field.
Ano de publicação: | 2017
Fonte/Imprenta: | Soil Use and Management, v. 33, n. 4, p. 583-594, 2017.
DOI: | http://dx.doi.org/10.1111/sum.12384
Idioma: | Inglês
Conteúdo: | Post-harvest biomass can be used as feedstock for energy production and alter N2O emissions from the soil, which is among the main issues determining bioethanol sustainability. To assess the effects of sugarcane straw return on gas emissions, we established a field experiment in which 0, 50, 75 or 100% (0, 5.65, 8.47 and 11.30 Mg/ha dry biomass, respectively) of the crop residues (straw) was left in the field during the first two ratoon crops. As fertilizer is applied in bands to sugarcane, we also investigated the contribution of different positions to the N2O emissions within the field. There was an interactive effect between straw and inorganic fertilizer, leading to a nonlinear effect of crop residues on the fertilizer emission factor (EF). However, straw consistently reduced N2O emissions from the field, acting mainly in the unfertilized areas in the field (P < 0.05). We observed that considering the typical EF used in the literature, the N2O-N emissions attributed to fertilizer ranged from 0.19 to 0.79 kg/ha, while the total emissions ranged from 3.3 to 5.2 kg/ha, from the highest amount of straw to the lowest. We conclude that overall, the fertilizer EF is not as relevant as the total emissions, based on this and other studies. Consequently, management practices might be more effective in improving the GHG balance than changing inorganic fertilizer use. We conclude that keeping up to 11 Mg/ha of straw with a large C:N ratio (>100:1) on site might increase sugarcane production sustainability by reducing the greenhouse gas emissions from the field.
Palavras-Chave: | Emissão de gasesNitrogen; Óxido nitroso; Sustainability.
Thesagro: | Cana de açúcar; Nitrogênio; Palha.
Thesaurus Nal: | bioenergy; Greenhouse gas emissions; Nitrous oxide; soil; Straw; Sugarcane.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Meio Ambiente (CNPMA)
Exemplares: | CNPMA - (16002-1) - UPC - AP - DD -  -  -  - DIS